Always Be Tuning

The problem with the 10,000 hour rule is that it creates a half truth. The fine print of the rule is that extremely high quality practice matters, so 10,000 hours spent taking the same failed shot over and over and over are worth less than 1 hour spent tuning the dial, measuring where problems crop up, and taking that new data into account on the next try. Grinding hard and heavily is necessary, yes. But focus will always matter more.